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Old 04-26-2010, 08:12 AM   #1 (permalink)
Q-01
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Please help find fuel leak

As I mentioned in my intro thread, I had a valve spring replaced on this 1990 Suburban several months ago. At that time I also had new fuel injectors installed.

Initially, there were a few leaks on the fuel return lines as the shop didn't put the hose clamps on. Then there was a leak where a rear injector didn't have the unused return hole plugged good. I took it back in 2 weeks ago and they installed the GM return line kit and its been fine since then until yesterday.

I pulled into the driveway and noticed the usual puddle from the a/c, but there were 3 more puddles in line with the a/c puddles but further under the rear of the engine... dripping from the bell housing and back of the oil pan and off of those two lines that run across the back of the oil pan.

The machanic is a friend of mine (not so much that he doesn't charge me) and I really don't want want to take it back up there. It has been a few weeks with no leaks since I got it back last time. Also, I should mention, the last time it started leaking, it had not been driven in a week or so. It was dry one day and the next it had a puddle under it...same place as now...???


Help

Thank you!


Last edited by Q-01; 04-26-2010 at 08:13 AM.
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Old 04-26-2010, 08:36 AM   #2 (permalink)
sls639
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Check your valley with a flashlight, see if it's wet. There is a drain hole at the back of the valley that drains down between the engine and trans. If he replaced a valve, he had to mess with the fuel lines at the back of the injection pump, could be leaking from one of these lines. Other culprits,...the feed for the IP, throttle shaft, advance pushrod (which is low on the IP on the pass side, button thingy in the pic, pic shows with arm removed.). It is typical for these drain holes to be plugged, partially or fully. It has probably leaked since the work was done only just now showing up.

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Old 04-26-2010, 09:46 AM   #3 (permalink)
4320Diesel
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Yea!
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1985 GMC (The Brown Streak) Sierra Classic 1500 4WD With 6.2L V8 Diesel and 4speed NP833 trans with hurst shifter! , 4911 6.5 ip with 6.5 shortie injectors GM-3 turbo. Single plane J code intake from Turbonator (thanks guys!). 3" exhaust and 3" BBQ black stacks! Isspro Pyrometer, Trisco Boost and Engine Oil Temp Gauges.
1998 Dodge Ram 2500 Sport club cab short box 4WD 5 speed 12 Valve cummins. Brentbilt fuel plate. 300 horse motorhome injectors, boost elbow, timing bumped to 18* autometer boost and pyro, 500 horse valair clutch waiting to go in!
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your wrong brent, i'll think of a reason later

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brent can't do that, it would look factory, lol

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Brent is right.
Was there any ever doubt?
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Old 04-26-2010, 10:03 AM   #4 (permalink)
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Found leak - how to repair??

Thanks guys.

The leak is coming from the right (driver's ) side of the throttle shaft. That explains the sudden leak around the tranny. It looks like the drain hole is pretty plugged up and probably had to have a lot of fuel build up before it spilled through. I have read that it can be repaired without removing the IP.

Does anyone have a link, or instructions on how to repair the throttle shaft leak. I'm a pretty decent mechanic, but never worked on a diesel or IP. It's a 1990.

Thanks
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Old 04-26-2010, 08:06 PM   #5 (permalink)
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Disregard.

I got a new IP.

Thanks
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Old 04-26-2010, 08:50 PM   #6 (permalink)
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^ best solution, once when seal goes the others will soon follow.
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